105103021 has 2 divisors, whose sum is σ = 105103022. Its totient is φ = 105103020.

The previous prime is 105103007. The next prime is 105103039. The reversal of 105103021 is 120301501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 21288996 = 9155^2 + 4614^2 .

It is an emirp because it is prime and its reverse (120301501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 105103021 - 2¹⁷ = 104971949 is a prime.

It is a super-2 number, since 2×105103021² = 22093290046652882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 105102992 and 105103010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105143021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52551510 + 52551511.

It is an arithmetic number, because the mean of its divisors is an integer number (52551511).

Almost surely, 2^105103021 is an apocalyptic number.

It is an amenable number.

105103021 is a deficient number, since it is larger than the sum of its proper divisors (1).

105103021 is an equidigital number, since it uses as much as digits as its factorization.

105103021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 105103021 is about 10251.9764435937. The cubic root of 105103021 is about 471.9236401537.

Adding to 105103021 its reverse (120301501), we get a palindrome (225404522).

It can be divided in two parts, 10510 and 3021, that added together give a palindrome (13531).

The spelling of 105103021 in words is "one hundred five million, one hundred three thousand, twenty-one".